Perhaps you should try some spelling variations:
"lua toc cong snippets" » "lua toc code snippets", "lua hoc cong snippets", "lua truoc cong snippets", "lua thuoc cong snippets", "cua toc cong snippets", "lua tuoi cong snippets", "lua nuoc cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("python using java snippets") or ("lua toc cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("lua toc cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( lua toc cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("lua toc cong snippets"))) or ("locating bug core snippets"))*.